date and time of

Bit integral typeThe bit data type is integral, and its value can only be 0, 1, or null. This data type is used to store data that has only two possible values, such as Yes or No, True or false, on, or off.Note: A data type that is space-saving and

MySQL field type detailedOriginal: http://www.cnblogs.com/100thMountain/p/4692842.htmlMySQL supports a large number of column types, which can be divided into 3 categories: numeric types, date and time types, and string (character) types. This

Citation@author: http://www.cnblogs.com/geaozhang/Possible requirements:What is the current time, the next month's today is the day of the week, statistics up to the current date 3 days before the sum of income ...These requirements need to be

SQL functionsAggregation functions (for numeric columns):Avg: Averaging pointsCoint: Number of calculationsMax: Ask for maximum valueMin: Find minimum valueSum: Sum        Math function ():   ABS:     Absolute Value    CEILING: Upper bounds

Blue SealMySQL data types can be divided into 3 categories: numeric type , date and Time type , and string (character) typeSquare brackets ("[" and "]") indicate the part of the optional type modifierMIndicates the maximum display size. The largest

Date and Time functionsPossible requirements:What is the current time, the next month's today is the day of the week, statistics up to the current date 3 days before the sum of income ...These requirements need to be implemented using date and time

Decimal exact numeric typeThe decimal data type can be used to store numeric data of a fixed precision and range from 10 to 38 powers-1 to 10 of 38 power-1. When you use such a data type, you must specify the range and precision. The range is the

One, character conversion function1. ASCII ()Returns the ASCII value of the leftmost character of a character expression. In the ASCII () function, a string of pure numbers is not "enclosed", but a string with other characters must be used in '

Bit integral typeThe bit data type is integral, and its value can only be 0, 1, or null. This data type is used to store data that has only two possible values, such as Yes or No, True or false, on, or off.Note: A data type that is space-saving and

1 Traversing a directoryCd:change dicrectory abbreviation. Or./represents the current directory,.. Or.. /represents the previous table of contents, CD-Represents the last directory entered.2 List of files and directoriesLs:list, the file under the

HTTP Request FormatWhen the browser makes a request to the Web server, it passes a block of data to the server, which is the request information, and theHTTP request information consists of 3 parts: L Request method URI protocol /version L

Sqlite3 supported data types: NULL, INTEGER, REAL, TEXT, BLOBBut in fact, Sqlite3 also accepts the following data types:smallint a 16-bit integer.Interger a 32-bit integer.Decimal (P,S) p exact value and S-Size decimal integer, the exact value p is

Three ways to use Android date operations:1.Date2.Calendar3.Unix time Stamp1 and 2 in the calculation of the specific date convenience high, 3 calculation on the convenience and flexibility, high efficiency. The conversion of strings to date objects

Working with Dates in PL/SQL (date used in PL/SQL) The previous articles in this introductory PL/SQL series focused on working with strings and numbers in PL/SQL-based applications. without a doubt, strings and numbers are important, but it is

http://www.cnblogs.com/li0803/archive/2008/11/03/1324746.html Introduction                                   HTTP is an object-oriented protocol belonging to the application layer, which is suitable for distributed hypermedia information System

Quick query of js functions allows you to quickly find related functions. The abs method returns the absolute value of a number. The acos method returns the arc cosine of a number. The anchor method adds an HTML anchor with the NAME attribute at

　Related articles: Compression of HTTP protocolToday's Web program development technology is really a contention, ASP, PHP, Jsp,perl, AJAX and so on. Regardless of how web technologies evolve in the future, it is important to understand the basic

HTTP is an object-oriented protocol belonging to the application layer, which is suitable for distributed hypermedia information System because of its simple and fast way. It was proposed in 1990, after several years of use and development, has been

Source: The blog of the Green Snow ClubTCP HTTP UDP:is the communication protocol, that is, the rules of communication, only the two parties in accordance with this rule "speak", the other party can understand or serve.The relationship between TCP

HTTP protocol explanation (really classic)IntroductionHTTP is an object-oriented protocol belonging to the application layer, which is suitable for distributed hypermedia information System because of its simple and fast way. It was proposed in 1990,